Influence of Nanomaterials on the Mechanical Behavior of Cementitious Composites

Objective: To investigate the influence of nanomaterials on the mechanical behavior of cement-based composites. Methods: Chemical cross-linked polyacrylamide hydrogel combined with silica nanoparticles was used as a model system for polymerization and sample preparation, MCR302 rotating converter determined the elastic modulus of hydrogel, and several sets of experiments were performed by changing the concentration of crosslinker, monomer and nanoparticles. Results: The elastic modulus was positively correlated with the concentration of the crosslinking agent and the nanoparticles. The nanoparticle-mediated enhancement was different from the chemical crosslinking, and there was a joint crosslinking density saturation point, and the nanoparticle-mediated enhancement changed in the temperature influence experiment. Conclusion: Nanoparticles can change the mechanical properties of hydrogels, and their enhancement mechanism is related to many factors. This study helps to understand the role of nanomaterials in improving the mechanical properties of cement-based composites, and provide a theoretical basis for the development of related applications.